I got the following fault code from by Hilux - B1801 Open in D Suib Circuit.
This code means that there is an open circuit in the spiral cable assembly just below the steering wheel, this is a known problem and replacing it will correct the problem, the steering wheel will have to be removed and the spiral cable replaced, this is a dealer only item. If detailed instructions are needed to replace please reply. This part is covered under the toyota factory warranty for 5yrs/60,000 miles.
TOYOTA MASTER TECH, ASE CERTIFIED